J has a very introverted personality, making it difficult to discern what he is thinking. Despite his appearance, J is health-conscious and prefers to eat healthy food such as salads and decaffeinated products.[2][1]

J, alongside Roxy and Axl, appear in Abigail's character story, reminding him that he let the trio borrow his car (which Abigail thought was missing) and mocks him for forgetting his promise. Furious, Abigail throws them all into the car and walks away.

J appeared with Damnd and Mic in Super Street Fighter #1, where they eat in the Chinese restaurant owned by Yun and Yang. Damnd refuses to pay the bill, saying that asking him to pay is an offense and menacingly ordering another free meal to calm him down, resulting in him being beaten by the twins and knocked over J and Mic.

J is a straightforward fighter who delivers basic punch attacks. He is one of the weakest members in the Mad Gear Gang, but he moves fast and tends to strike enemies from behind with fast punches, being hard to escape from his combos when he starts attacking.